Find and replace a character in a string in Go
String manipulation functions are a must have for a programming language and Go has plenty of them. In this tutorial we will see how to find and replace characters in a string.
strings.Replace() function will take in 4 parameters.
- First is the input string.
- Second is characters or words to find
- Third is the new replacement
- Fourth is the number ( n ) of instances found and to be replaced.
If n < 0, there is no limit on the number of replacements.
To find and replace white spaces from a string
str := " This string has many spaces that need to be replaced "
fmt.Println(strings.Replace(str, " ", "", -1))
because we want to remove unlimited instances of spaces in the string. We will use -1 as the fourth parameter. You can use -20 or -5 if you want. Remember the rule :
If n < 0, there is no limit on the number of replacements.
The above code output will be :
Thisstringhasmanyspacesthatneedtobereplaced
Full example code :
package main
import (
"fmt"
"strings"
)
func main() {
str := " This string has many many spaces that need to be replaced "
fmt.Println(strings.Replace(str, " ", "", -1))
str2 := " This string has much much spaces that need to be replaced "
fmt.Println(strings.Replace(str2, "much", "many", 2))
}
output :
Thisstringhasmanymanyspacesthatneedtobereplaced
This string has many many spaces that need to be replaced
Reference :
See also : Golang :Trim white spaces from a string
By Adam Ng
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